Bike instead of driving. Join the National Bike Commute Challenge and participate in Walk & Roll Wednesdays with the Butte Bicycle Coalition.
Maintain your car; properly inflate tires and kept it tuned up for efficient driving.
Shift daily trips to walking, cycling, carpooling, or public transportation; this is one of the most impactful things you can do to reduce your carbon footprint.
Rebates of up to $2,500 per light-duty vehicle are available for individuals and business owners who purchase or lease new eligible zero-emission or plug-in hybrid electric vehicles. More here.
Find a fuel-efficent car. There's a wealth of information and tools here.